Steers round most of adjacent turning (4)
I believe the answer is:
oxen
'steers' is the definition.
(I've seen this before)
'round most of adjacent turning' is the wordplay.
'round' becomes 'o' (round can mean a round object**).
'most of' means to remove the last letter.
'adjacent' becomes 'next' ('next' can be a synonym of 'adjacent').
'turning' says the letters should be written backwards.
'next' with its final letter removed is 'nex'.
'nex' reversed gives 'xen'.
'o'+'xen'='OXEN'
(Other definitions for oxen that I've seen before include "Bullocks" , "Bovine animals, in yoke" , "Lowers" , "Bulls, buffaloes, etc" , "(E.g. draught) cattle" .)