Call a GI out for being extremely cold? (7)
I believe the answer is:
glacial
'being extremely cold?' is the definition.
(I've seen this before)
'call a gi out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'call'+'a'+'gi'='callagi'
'callagi' with letters rearranged gives 'GLACIAL'.
'for' acts as a link.
(Other definitions for glacial that I've seen before include "Icy; distant" , "Relating to ice" , "Ice cold" , "Frigid" , "Cold and icy" .)