Crossword Genius

Two girls, note, fit together perfectly (10)

Ross

I believe the answer is:

tessellate

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'fit together perfectly' is the definition.
I can't judge whether this definition defines the answer.

'two girls note' is the wordplay.
'two girls' becomes 'tessella' (I can't justify this - if you can you should believe this answer much more).
'note' becomes 'te' (musical note).
'tessella'+'te'='TESSELLATE'

Can you help me to learn more?

(Other definitions for tessellate that I've seen before include "marked in little squarish areas" , "make a patterned floor?" , "Form a mosaic - sell estate (anag)" , "Create mosaic" , "Decorate with mosaics" .)

I've seen this clue in The Times.
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