Love collecting first of caterpillars in spring after climbing tree (8)

I believe the answer is:

sycamore

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'tree' is the definition.
(sycamore is a kind of tree)

I can't explain the rest of the clue.

(Other definitions for sycamore that I've seen before include "Eurasian maple-tree" , "The tree is strangely so creamy" , "Great maple tree" , "Deciduous tree" , "Wood" .)

I've seen this clue in The Guardian.

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