Past, present or future (5)
I believe the answer is:
tense
This clue is a double definition.
'past' is the first definition.
(past tense)
'present or future' is the second definition.
(I know that present is a type of tense)
(Other definitions for tense that I've seen before include "Maybe past" , "Anxious, nervous" , "Rigid; verb form" , "perfect, perhaps" , "under pressure" .)