Hospital agreed to change, accepting a cap, say (8)
I believe the answer is:
headgear
'cap say' is the definition.
(I know that cap is a type of headgear)
'hospital agreed to change accepting a' is the wordplay.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'to change' is an anagram indicator.
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'agreed' is an anagram of 'eadger'.
'eadger' placed around 'a' is 'eadgear'.
'h'+'eadgear'='HEADGEAR'
(Other definitions for headgear that I've seen before include "which sits on top of mine?" , "Aged hare? (anagram)" , "Perhaps a hat" , "Hats, bonnets, caps etc" , "Trilby e.g" .)