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Sudden recollections involving ostentatious defenders (10)

Ross

I believe the answer is:

flashbacks

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'sudden recollections' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'ostentatious defenders' is the wordplay.
'ostentatious' becomes 'flash' (I've seen this before).
'defenders' becomes 'backs' (I've seen this before).
'flash'+'backs'='FLASHBACKS'

'involving' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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