A female redhead in jug (4)
I believe the answer is:
ewer
'jug' is the definition.
(type of vessel)
'a female redhead' is the wordplay.
'a female' becomes 'ewe' (female sheep).
'redhead' becomes 'r' (the head/first letter of 'red').
'ewe'+'r'='EWER'
'in' acts as a link.
(Other definitions for ewer that I've seen before include "Were (anag)" , "29 [VESSEL]" , "from which liquid may be poured" , "Sort of jug" , "Large, wide-mouthed jug" .)