For a start, many a tube gets bent (5)
I believe the answer is:
debut
'for a start' is the definition.
(debut is a kind of start)
'many a tube gets bent' is the wordplay.
I cannot really understand how this works, but
'many' could be 'd' and 'd' is located in the answer.
an anagram of 'tube' is 'ebut' which is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for debut that I've seen before include "First attempt" , "Tubed (anag.)" , "The coming out of a society girl" , "Initial appearance" , "First public appearance of performer" .)