English 101 subject (5)
I believe the answer is:
tense
'english 101 subject' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tense that I've seen before include "(Of muscle) tight" , "Verb form indicating time" , "Verb form, indicates time" , "perfect, perhaps" , "Rigid, or grammatical time" .)