Two Instances of Clamd running

I've got two instances of clamd running on my server and it's sucking 60% of my Memory allocation.

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top - 08:34:41 up 32 min,  1 user,  load average: 0.00, 0.04, 0.14
Tasks: 146 total,   1 running, 145 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.0 us,  1.0 sy,  0.0 ni, 97.2 id,  0.0 wa,  0.0 hi,  0.2 si,  0.7 st
KiB Mem :  1882576 total,    92308 free,  1641380 used,   148888 buff/cache
KiB Swap:   524284 total,   226848 free,   297436 used.    79476 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 5240 amavis    20   0  837436 566280   2576 S   0.0 30.1   0:14.47 clamd
 1571 amavis    20   0  837568 563556    480 S   0.0 29.9   0:16.84 clamd
 5250 amavis    20   0  367108 106644   2756 S   0.0  5.7   0:00.48 /usr/sbin/+
 5238 amavis    20   0  362956 103896   2516 S   0.0  5.5   0:01.23 /usr/sbin/+
 5251 amavis    20   0  364500 102868   1488 S   0.0  5.5   0:00.00 /usr/sbin/+
Can anyone provide any suggestions as to how I can stop one of them or how to find out why there are two instances running.

Thanks in anticipation.

UPDATE:

So I stopped Clamd from my server control panel, and that removed PID 5241, but PID 1571 remained.

Eventually, I 'bit the bullet' and did

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# kill -9 1571

which removed it, but it was immediately replaced with another instance.

Do I still need to start clamd in my web panel ?

It's a production server so I can't afford to get this wrong

One is part of Amavis for scanning mail and the other is Clamd (daemon) depending on how Amavis is setup killing the process could stop your mail from working properly