Flowers bitterns possibly observed around lake? (8)

I believe the answer is:

bloomers

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'flowers bitterns possibly observed around lake?' is the definition.
I can't tell whether this defines the answer.

'bitterns possibly observed around lake?' is the wordplay.
'bitterns possibly' becomes 'boomers' (bitterns make a booming noise).
'observed around' indicates putting letters inside.
'lake?' becomes 'L' (geographical abbreviation).
'boomers' placed around 'l' is 'BLOOMERS'.

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(Other definitions for bloomers that I've seen before include "Old underwear" , "Embarrassing mistakes" , "clothes" , "displayed in bed" , "Flora" .)

I've seen this clue in The Times.

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