Unironed ends of collar smoothed (7)
I believe the answer is:
creased
'unironed' is the definition.
('creased' can be similar in meaning to 'unironed')
'ends of collar smoothed' is the wordplay.
'ends of' suggests removing the centre.
'smoothed' becomes 'eased'.
'collar' with its middle removed is 'cr'.
'cr'+'eased'='CREASED'
(Other definitions for creased that I've seen before include "Wrinkled, rumpled" , "Needing to be ironed?" , "Crumpled - red case (anag)" , "Groovy" , "Folded" .)