Ben avoided faulty gas turbine instruments (7)
I believe the answer is:
guitars
'instruments' is the definition.
(guitar is a kind of instrument)
'ben avoided faulty gas turbine' is the wordplay.
I cannot quite understand how this works, but
'gas' could be 'ars' (Ar is an example) and 'ars' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for guitars that I've seen before include "Stringed instruments" , "Axes" .)