Horse and English sheep turned up (4)
I believe the answer is:
mare
'horse' is the definition.
(mare is a kind of horse)
'english sheep turned up' is the wordplay.
'english' becomes 'e' (abbreviation).
'sheep' becomes 'ram' (ram is a kind of sheep).
'turned up' is a reversal indicator.
'e'+'ram'='eram'
'eram' back-to-front is 'MARE'.
'and' acts as a link.
(Other definitions for mare that I've seen before include "Female equine animal" , "Adult female horse" , "Horse; lunar sea" , "For classicists, sea" , "A night-time strangler" .)