Pacific Island right by nice ground (6)
I believe the answer is:
irenic
'pacific' is the definition.
(synonyms)
'island right by nice ground' is the wordplay.
'island' becomes 'i' (geographical abbreviation).
'right' becomes 'r' (common abbreviation).
'by' says to put letters next to each other.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'nice' is an anagram of 'enic'.
'i'+'r'+'enic'='IRENIC'
(Other definitions for irenic that I've seen before include "Peaceful" , "Pacific" , "peace-loving" , "peaceable" .)