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Reservist having row about blunder (7)

Ross

I believe the answer is:

terrier

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

'row about blunder' is the wordplay.
'row' becomes 'tier' (tier is a kind of row).
'about' is an insertion indicator.
'blunder' becomes 'err' (I've seen this before).
'tier' going around 'err' is 'TERRIER'.

'having' acts as a link.

Can you help me to learn more?

(Other definitions for terrier that I've seen before include "Bedlington - -" , "inventory of property" , "part-timer in Services" , "Short-bodied canine" , "(Yorkshire?) dog" .)

I've seen this clue in The Times.
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