Growing evidence of when to write? (5)
I believe the answer is:
aspen
'growing evidence' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'when to write?' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'to write?' becomes 'pen' (synonyms).
'as'+'pen'='ASPEN'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for aspen that I've seen before include "Trembling poplar tree" , "quill-like?" , "somewhere in Colorado" , "Tree, kind of poplar" , "Type of poplar" .)