Blunder admitted by volunteers turning up gas tanks for reptiles (8)

I believe the answer is:

terraria

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'tanks for reptiles' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'blunder admitted by volunteers turning up gas' is the wordplay.
'blunder' becomes 'err' (I've seen this before**).
'admitted by' indicates putting letters inside.
'volunteers' becomes 'ta' (abbreviation for Territorial Army).
'turning up' is a reversal indicator.
'gas' becomes 'air'.
'air' written backwards gives 'ria'.
'err' going into 'ta' is 'terra'.
'terra'+'ria'='TERRARIA'

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I've seen this clue in The Times.

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