Lack of concentration is responsible for this feeble answer (4,8)

I believe the answer is:

weak solution

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'lack of concentration is responsible for this' is the definition.
The definition suggests a singular noun which matches the answer.

'feeble answer' is the wordplay.
'feeble' becomes 'weak' (synonyms).
'answer' becomes 'solution' (synonyms).
'weak'+'solution'='WEAK SOLUTION'

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