Gossip about old island, cold and disorganised (7)
I believe the answer is:
chaotic
'disorganised' is the definition.
(similar in meaning)
'gossip about old island cold' is the wordplay.
'gossip' becomes 'chat' (synonyms).
'about' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'island' becomes 'i' (geographical abbreviation).
'cold' becomes 'C' (eg on taps).
'chat' going around 'o' is 'chaot'.
'chaot'+'i'+'c'='CHAOTIC'
'and' acts as a link.
(Other definitions for chaotic that I've seen before include "badly arranged" , "In complete confusion" , "All over the place" , "Confused, disordered" , "In complete disorder" .)