Crossword Genius

Thanks a million for the hat! (3)

Ross

I believe the answer is:

tam

'the hat' is the definition.
(thesaurus)

'thanks a million' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'a million' becomes 'm' (abbreviation).
'ta'+'m'='TAM'

'for' acts as a link.

(Other definitions for tam that I've seen before include "'Woollen cap of Scottish origin, in short (3)'" , "Headgear" , "Turn over the mat for a cap" , "Index rating for TV watching" , "...-o'-shanter, Scottish cap" .)

I've seen this clue in the Evening Standard.
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