Ring is taken in by sect - the one specialising in visions? (7)
I believe the answer is:
oculist
'one specialising in visions?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'ring is taken in by sect' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'taken in by' is an insertion indicator.
'sect' becomes 'cult' (I've seen this before).
'is' put inside 'cult' is 'culist'.
'o'+'culist'='OCULIST'
'the' is the link.
Can you help me to learn more?
(Other definitions for oculist that I've seen before include "Specialist in treatment of the eyes" , "Pupils' examiner" , "One working with seers" , "Old-fashioned eye doctor" , "Man of vision" .)