Kind to have an impact on island edges in tide (12)

I believe the answer is:

affectionate

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'kind' is the definition.
(thesaurus)

'have an impact on island edges in tide' is the wordplay.
'have an impact on' becomes 'affect' (I've seen this in another clue).
'island' becomes 'iona' (Scottish island).
'edges in tide' becomes 'te' (I can't explain this - if you can you should believe this answer much more).
'affect'+'iona'+'te'='AFFECTIONATE'

'to' acts as a link.

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(Other definitions for affectionate that I've seen before include "friendly" , "Fond" , "Displaying fondness" , "Tender" , "Showing fondness" .)

I've seen this clue in The Times.

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