Urge some lesser Pentagon characters to turn to the other side (5)
I believe the answer is:
press
'urge' is the definition.
(I know this)
'some lesser pentagon characters to turn to the other side' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'to turn to the other side' says the letters should be written in reverse.
'sserp' is hidden within 'lesser pentagon characters'.
'sserp' in reverse letter order is 'PRESS'.
(Other definitions for press that I've seen before include "Crowd; urge" , "newspapermen?" , "needed to avoid crooked racket" , "Harass; media" , "Forcibly enlist" .)