Son, given a reminder to trail about, got free (7)
I believe the answer is:
rescued
'got free' is the definition.
'son given a reminder to trail about' is the wordplay.
'son' becomes 's'.
'given a reminder' becomes 'cued'.
'to trail' is a charade indicator (letters next to each other).
'about' becomes 're' (regarding**).
's'+'cued'='scued'
'scued' put after 're' is 'RESCUED'.
(Other definitions for rescued that I've seen before include "Saved from - seducer (anag)" , "Extricated" , "Saved (from danger)" , "set free" , "Secured (anag.)" .)