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Thanks a lot, but it's not very much! (3)

Ross

I believe the answer is:

tad

'it's not very much' is the definition.
(I've seen this in another clue)

'thanks a lot' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'a lot' becomes 'd' ().
'ta'+'d'='TAD'

'but' acts as a link.

(Other definitions for tad that I've seen before include "Small bit" , "Smidgen" , "little boy" , "Little bit" , "Small amount or degree" .)

I've seen this clue in the Evening Standard.
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