Dry land? I'll say! (4)

I believe the answer is:

isle

'dry land?' is the definition.
(isle is a kind of dry land)

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

(Other definitions for isle that I've seen before include "Skye or Capri?" , "Eg, Staffa" , "cut-off location" , "'This scepter'd - - (Shakespeare)" , "This could be key" .)

I've seen this clue in the Evening Standard.

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