Somehow, is crop circle a sign? (7)
I believe the answer is:
scorpio
'a sign?' is the definition.
(Scorpio is an example)
'somehow is crop circle' is the wordplay.
'somehow' is an anagram indicator.
'circle' becomes 'o'.
'is'+'crop'='iscrop'
'iscrop' is an anagram of 'scorpi'.
'scorpi'+'o'='SCORPIO'
(Other definitions for scorpio that I've seen before include "8th sign of the zodiac" , "Oct-Nov zodiac sign" , "Eighth sign of the Zodiac, kind of spider" , "Sign of autumn" , "Ford model?" .)