Trembling panes can shatter! (5)

I believe the answer is:

aspen

I'm a little stuck... Click here to teach me more about this clue!

'trembling' is the definition.
(I've seen this before)

'panes can shatter' is the wordplay.
'panes' can be anagrammed to 'ASPEN'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for aspen that I've seen before include "Tmorous" , "Very timid" , "quill-like?" , "Growth" , "Trembling poplar tree" .)

I've seen this clue in the Evening Standard.

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