A thousand extra at work (4)
I believe the answer is:
perk
'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" .)