Crossword Genius

A thousand extra at work (4)

Ross

I believe the answer is:

perk

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'extra at work' is the definition.
'perk' can be an answer for 'work' (thesaurus). I am not sure about the 'extra at' bit.

'a thousand' is the wordplay.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'thousand' becomes 'k' (synonyms).
'per'+'k'='PERK'

Can you help me to learn more?

(Other definitions for perk that I've seen before include "Tip" , "Informal goodie given on top of salary" , "Company car, for example" , "A little extra" , "Incidental gain" .)

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