Appraise one in storyline, one like Brian Trubshaw? (4,5)
I believe the answer is:
test pilot
'one like brian trubshaw?' is the definition.
(Brian Trubshaw was a Concorde test pilot)
'appraise one in storyline' is the wordplay.
'appraise' becomes 'test' (appraise can mean to assess or test).
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'storyline' becomes 'plot' (eg the plot of a film).
'i' put inside 'plot' is 'pilot'.
'test'+'pilot'='TEST PILOT'
(Other definitions for test pilot that I've seen before include "Airman" , "one occupying 21 [COCKPIT]" , "high flier" , "highflying expert" , "Alan Shepard once?" .)