Feature in Ipswich intriguing (4)
I believe the answer is:
chin
'feature' is the definition.
(facial feature)
'in ipswich intriguing' is the wordplay.
'in' says the answer is hidden in the clue.
'CHIN' can be found hidden inside 'ipswich intriguing'.
(Other definitions for chin that I've seen before include "narrow opening" , "'... up, stay cheerful (4)'" , "Protruding part of lower jaw" , "part of mug" , "Possible double feature?" .)