BBC pioneer backing row with husband (5)
I believe the answer is:
reith
'bbc pioneer' is the definition.
(I've seen this before)
'backing row with husband' is the wordplay.
'backing' shows that the letters should be reversed in order.
'row' becomes 'tier' (a tier is a row of things).
'with' is a charade indicator (letters next to each other).
'husband' becomes 'h' (abbreviation).
'tier' backwards is 'reit'.
'reit'+'h'='REITH'
(Other definitions for reith that I've seen before include "John, first BBC Director-General, 1927-38" , "Lord --, BBC founder" , "One put in charge of the BBC" , "head of broadcasting" , "BBC radio pioneer" .)