Force inlets, somehow, to shine (7)
I believe the answer is:
glisten
'to shine' is the definition.
(synonyms)
'force inlets somehow' is the wordplay.
'force' becomes 'g' (short for gravity).
'somehow' is an anagram indicator.
'inlets' with letters rearranged gives 'listen'.
'g'+'listen'='GLISTEN'
(Other definitions for glisten that I've seen before include "Glow from reflection" , "look bright" , "Shine or sparkle wetly" , "Singlet (anag.); tingles (anag.)" , "Be a shining example" .)