Recreational vehicle held by signal leading to bend (5)
I believe the answer is:
curve
'bend' is the definition.
(synonyms)
'recreational vehicle held by signal' is the wordplay.
'recreational vehicle' becomes 'RV' (abbreviation).
'held by' is an insertion indicator.
'signal' becomes 'cue' (as in an actor's cue).
'rv' placed within 'cue' is 'CURVE'.
'leading to' is the link.
(Other definitions for curve that I've seen before include "Line on a graph" , "No part of this line is straight" , "way of learning" , "Arch" , "Wind" .)