Member pressing head of orchid with a pleasant smell (5)

I believe the answer is:

aroma

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

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

I cannot understand how the remainder of the clue works.

(Other definitions for aroma that I've seen before include "Agreeable odour" , "Test of knowledge" , "Savour" , "Redolence" , "Perfume" .)

I've seen this clue in The Telegraph.

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