Bouncer in row about horse? (6)
I believe the answer is:
tigger
'bouncer' is the definition.
(I've seen this before)
'row about horse?' is the wordplay.
'row' becomes 'tier' (a tier is a row of things).
'about' means one lot of letters goes inside another.
'horse?' becomes 'gg' (geegee or GG is a childish term for a horse).
'tier' going around 'gg' is 'TIGGER'.
'in' acts as a link.
(Other definitions for tigger that I've seen before include "Fictional bouncer" , "Milne character" , "One of Pooh's friends" , "Bouncy friend of 19" , "Bouncy beast (Pooh)" .)