Draw-in frontiersmen? (3)
I believe the answer is:
tie
'draw' is the definition.
('tie' can be a synonym of 'draw')
'in frontiersmen?' is the wordplay.
'in' indicates a hidden word.
'TIE' can be found hidden inside 'frontiersmen'.
(Other definitions for tie that I've seen before include "hamper" , "Finish level" , "restraint" , "Bond > girl wearing this? Unlikely" , "Bind; be equal" .)