This perhaps starts with hyacinths in full flower (5)

I believe the answer is:

whiff

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'starts with hyacinths in full flower' is the wordplay.
'starts' says to take the initial letters.
The initial letters of 'with hyacinths in full flower' is 'WHIFF'.

'perhaps' acts as a link.

Can you help me to learn more?

(Other definitions for whiff that I've seen before include "Puff" , "draught" , "Passing odour" , "Slight smell" , "A boat" .)

I've seen this clue in The Guardian.

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