Old bombs in possibly poor condition (7)

I believe the answer is:

proviso

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'condition' is the definition.
(proviso is a kind of condition)

'old bombs in possibly poor' is the wordplay.
'old bombs' becomes 'vis' (resembles V1s - V1 was a World War 2 bomb. I am not sure about the 'old' bit.).
'in' means one lot of letters goes inside another.
'possibly' is an anagram indicator.
'poor' anagrammed gives 'proo'.
'vis' going inside 'proo' is 'PROVISO'.

Can you help me to learn more?

(Other definitions for proviso that I've seen before include "Condition for VIP or so" , "Condition attached to an agreement" , "Condition added to an agreement" , "Requirement" , "Stipulated condition" .)

I've seen this clue in The Times.

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