Crossword Genius

Sensible putting a boy in bulrush cover (8)

Ross

I believe the answer is:

reasoned

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'sensible' is the definition.
(thesaurus)

'a boy in bulrush cover' is the wordplay.
'boy' becomes 'son' (synonyms).
'in' is an insertion indicator.
'bulrush cover' becomes 'reed' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'son'='ason'
'ason' going within 'reed' is 'REASONED'.

'putting' acts as a link.

Can you help me to learn more?

(Other definitions for reasoned that I've seen before include "Logically derived" , "Argued, concluded" , "Argued or deduced" , "Logically valid" , "Debated in calm and logical way" .)

I've seen this clue in The Telegraph.
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