Milky tea? Call for change (7)
I believe the answer is:
lacteal
'milky' is the definition.
(I've seen this before)
'tea? call for change' is the wordplay.
'for change' indicates anagramming the letters (I've seen this in other clues).
'tea'+'call'='teacall'
'teacall' is an anagram of 'LACTEAL'.
(Other definitions for lacteal that I've seen before include "Milk-like; pertaining to milk" , "Milky resin" .)