Tool used in getting a gauge recalibrated (5)
I believe the answer is:
auger
'tool' is the definition.
(auger is a kind of tool)
'in getting a gauge recalibrated' is the wordplay.
'in' indicates a hidden word.
'AUGER' is hidden within 'getting gauge recalibrated'.
'used' acts as a link.
(Other definitions for auger that I've seen before include "A tool for boring hole in wood" , "Boring instrument" , "Tool with spiral point for boring" , "Tool for boring holes in wood" , "something that's boring" .)