Bonus, for each, £1,000 (4)

I believe the answer is:

perk

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'bonus' is the definition.
(thesaurus)

'each ps1000?' is the wordplay.
'each' becomes 'per'.
'psk000?' becomes 'k' (I can't explain this - if you can you should believe this answer much more).
'per'+'k'='PERK'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for perk that I've seen before include "Bonus" , "Tip" , "Cheer" , "Company car, for example" , "extra privilege" .)

I've seen this clue in The Independent and The Telegraph.

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