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More than one old ship discharges liquid (7)

Ross

I believe the answer is:

slavers

I'm a little stuck... Click here to teach me more about this clue!

'more than one old' is the definition.
I can't tell whether this definition defines the answer.

'ship discharges liquid' is the wordplay.
'ship' becomes 'slaver' (I've seen this before).
'discharges liquid' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'slaver'+'s'='SLAVERS'

Can you help me to learn more?

(Another definition for slavers that I've seen is " Some ships".)

I've seen this clue in The Times.
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