Abbreviation used for convenience (5)

I believe the answer is:

gents

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'for convenience' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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

I've seen this clue in the Evening Standard.

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