For fix, perch here perhaps, curt and tense (5)
I believe the answer is:
rivet
This clue could be a double definition.
'for fix' is the first definition.
(riveting is a kind of fixing)
'perch here perhaps curt and tense' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
Can you help me to learn more?
(Other definitions for rivet that I've seen before include "Clinch - bolt" , "join securely" , "Metal bolt that's hammered" , "Metal fastening pin" , "Bolt in iron" .)