Nationalist father takes jog around island (7)
I believe the answer is:
patriot
'nationalist' is the definition.
(synonyms)
'father takes jog around island' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'takes' means one lot of letters go next to another.
'jog' becomes 'trot' (synonyms).
'around' indicates putting letters inside.
'island' becomes 'i' (geographical abbreviation).
'trot' going around 'i' is 'triot'.
'pa'+'triot'='PATRIOT'
(Other definitions for patriot that I've seen before include "Chauvinist" , "Loyalist" , "No traitor" , "Tell perhaps" , "Country lover" .)