Sex trade offers something else (5)

I believe the answer is:

extra

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'else' is the definition.
(thesaurus)

'sex trade offers' is the wordplay.
'offers' indicates a hidden word (the clue holds or offers the answer).
'EXTRA' is hidden in the letters of 'sex trade'.

'something' is the link.
This may not be correct. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "more than usually" , "One playing small part" , "one added to the score" , "Auxiliary" , "Supplemental" .)

I've seen this clue in The Times.

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