Pine used in making tea chest (4)
I believe the answer is:
ache
'pine' is the definition.
(I've seen this before)
'in making tea chest' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ACHE' can be found hidden inside 'making tea chest'.
'used' acts as a link.
(Other definitions for ache that I've seen before include "painful" , "Persistent dull pain" , "Play up" , "Similar" , "Dull steady pain" .)