Crossword Genius

Fool around for a quarter hour in the bathroom (6)

Ross

I believe the answer is:

loofah

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

'the bathroom' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'fool around for a quarter hour' is the wordplay.
'around' says the letters should be written in reverse.
'for' is a charade indicator (letters next to each other).
'quarter hour' becomes 'h' (abbreviation. I am not sure about the 'quarter' bit.).
'fool' back-to-front is 'loof'.
'loof'+'a'+'h'='LOOFAH'

'in' is the link.

Can you help me to learn more?

(Other definitions for loofah that I've seen before include "Kind of bathroom sponge for rubbing back" , "Rough sort of sponge" , "Bath sponge made from dried plant fibres" , "Bathroom sponge for washing back" , "something by bath?" .)

I've seen this clue in the Evening Standard.
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