Nationalist group will be in touch (7)
I believe the answer is:
patriot
'nationalist' is the definition.
(synonyms)
'group will be in touch' is the wordplay.
'group' becomes 'trio' (a group of three).
'will be in' means one lot of letters goes inside another.
'touch' becomes 'pat' (pat is a kind of touch).
'trio' inserted inside 'pat' is 'PATRIOT'.
(Other definitions for patriot that I've seen before include "One with a strong love of country" , "New England sportsman" , "Tell perhaps" , "Country lover" , "One who loves his or her country" .)