Reps dropping a certain convenience (5)

I believe the answer is:

gents

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'certain convenience' is the definition.
'gents' can be an answer for 'convenience' (I've seen this before). I am unsure of the 'certain' bit.

'reps dropping a' is the wordplay.
'reps' becomes 'agents' (I've seen this before).
'dropping' suggests deleting specific letters.
'agents' with 'a' removed is 'GENTS'.

Can you help me to learn more?

(Other definitions for gents that I've seen before include "Public convenience" , "Men (colloq.)" , "toilet" , "Male loos" .)

I've seen this clue in the Sydney Morning Herald.

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