Dashing a long way round on search (7)
I believe the answer is:
raffish
'dashing' is the definition.
('raffish' can be a synonym of 'dashing')
'a long way round on search' is the wordplay.
'a long way' becomes 'far' (I've seen this before).
'round' says the letters should be written backwards.
'on' says to put letters next to each other.
'search' becomes 'fish' (fishing is a kind of searching**).
'far' reversed gives 'raf'.
'raf'+'fish'='RAFFISH'
(Other definitions for raffish that I've seen before include "Dashing" , "flashy and careless" , "bohemian" , "Rakish" , "like British airmen?" .)