27 across
Wood
surrounding
the
outskirts
of
Blackpool
gets
three
times
bigger
(7)
Wood surrounding the outskirts of Blackpool gets three times bigger (7)
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The definition is at the end of the clue.
How the clue works
Right, so gets three times bigger is the definition, that's your TREBLES. For the wordplay, take TREES for "wood", and wrap it around BL, which is just the outer letters (the outskirts) of Blackpool - first and last. Slot BL inside TREES and you get TRE-BL-ES.