Got temperature wearing hairpiece (7)
I believe the answer is:
twigged
'got' is the definition.
(I've seen this before)
'temperature wearing hairpiece' is the wordplay.
I cannot quite understand how this works, but
'temperature' could be 't' (abbreviation) and 't' is found within the answer.
'hairpiece' could be 'wig' (wig is a kind of hairpiece) and 'wig' is present in the answer.
The remaining letters 'ged' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for twigged that I've seen before include "Got wise" , "understood" , "like the elder" , "caught on" , "Got the point" .)