Passion in forest, city wanting it (7)

I believe the answer is:

ardency

'passion' is the definition.
(thesaurus)

'forest city wanting it' is the wordplay.
'forest' becomes 'arden' (I've seen this before).
'wanting' suggests deleting specific letters (to want something can mean to lack it or need it).
'city' with 'it' taken out is 'cy'.
'arden'+'cy'='ARDENCY'

'in' is the link.

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app