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I'll say it's not accessible by car (4)

Ross

I believe the answer is:

isle

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'not accessible by car' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'i'll say' is the wordplay.
'say' indicates a 'sounds like' (homophone) clue.
'ill' sounds like 'ISLE'.

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for isle that I've seen before include "eg Man, Ely" , "Man conceivably" , "one ringed in the main?" , "Land encircled by water" , "Wight or Man, say" .)

I've seen this clue in the Evening Standard.
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