Hold tight and you'll see the light! (5)
I believe the answer is:
clamp
'hold' is the definition.
(thesaurus)
'see the light' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'the light' becomes 'lamp' (lamp is a kind of light).
'c'+'lamp'='CLAMP'
'tight and you'll' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for clamp that I've seen before include "stack of bricks" , "Immobilise car - potato store" , "Gripping tool" , "Prevent moving" , "Device for holding things tightly" .)