Gets uptight (6)
I believe the answer is:
tenses
'gets uptight' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tenses that I've seen before include "Verb forms that indicate time" , "Future or past, say" , "Verb forms indicating time" , "Becomes stretched or taut" , "Categories of verbs" .)