Maybe Redknapp will reject international six-footer (5)
I believe the answer is:
louse
'six-footer' is the definition.
(a louse has six feet)
'maybe redknapp will reject international' is the wordplay.
'maybe redknapp' becomes 'louise' (Louise Redknapp).
'will reject' is a deletion indicator.
'international' becomes 'i' (abbreviation eg in IMF).
'louise' with 'i' removed is 'LOUSE'.
(Other definitions for louse that I've seen before include "scum" , "Parasite; nasty person" , "From cad" , "Unpleasant person" , "25 [PARASITE]" .)