Most frilly, encased in lilac – i.e., stimulating (7)

I believe the answer is:

laciest

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

'most frilly' is the definition.
(I've seen this in another clue)

'in lilac i e stimulating' is the wordplay.
'in' indicates the answer is hidden within the clue.
'LACIEST' is hidden within 'lilac i e stimulating'.

'encased' acts as a link.
This may not be right. It may be part of another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

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