Creator does without hint (8)
I believe the answer is:
Here is my best explanation:
'creator' is the definition.
(designer is a kind of creator)
'does without hint' is the subsidiary indication.
'does' becomes 'deer' (I've seen this in other clues).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'hint' becomes 'sign'.
'deer' enclosing 'sign' is 'designer'.
(Other definitions for designer that I've seen before include "One who determines the look of something", "Originator", "Person who creates or fashions things such as clothes", "Theatre set creator", "Resigned to being the creator, of fashion say", "Planner; draughtsman", "Fashion creator", "Draughtsman", "Style creator" and "Architect or couturier, say".)