Have doubts about English spinner (6)
I believe the answer is:
weaver
'spinner' is the definition.
(someone who weaves or spins thread)
'have doubts about english' is the wordplay.
'have doubts' becomes 'waver' (to waver is to have doubts or hesitate).
'about' is an insertion indicator.
'english' becomes 'E' (abbreviation).
'waver' going around 'e' is 'WEAVER'.
(Other definitions for weaver that I've seen before include "Bottom's trade in A M N D" , "Worker with cloth" , "Loom worker; tropical bird" , "Fabric maker" , "Bottom's trade (MND)" .)