Crossword Genius

Row about 500 + 500 + 50 being small? (7)

Ross

I believe the answer is:

tiddler

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'small?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'row about 500 500 50' is the wordplay.
'row' becomes 'tier' (a tier is a row of things).
'about' means one lot of letters goes inside another.
'500' becomes 'D' (Roman numeral for 500).
'500' becomes 'D' (Roman numeral for 500).
'50' becomes 'l' (Roman numeral).
'd'+'d'+'l'='ddl'
'tier' placed around 'ddl' is 'TIDDLER'.

'being' is the link.

Can you help me to learn more?

(Other definitions for tiddler that I've seen before include "Small fish (or child?)" , "Small fish (colloq,)" , "Minnow" , "A small fish children try to catch" , "One small" .)

I've seen this clue in The Guardian.
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