Crossword Genius

To summarise, it's about top (5)

Ross

I believe the answer is:

recap

'to summarise' is the definition.
(recapping is a kind of summarizing)

'about top' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'top' becomes 'cap' (cap is a kind of top).
're'+'cap'='RECAP'

'it's' acts as a link.

(Other definitions for recap that I've seen before include "In brief, go over the main points again" , "look back on past things" , "Summarise briefly (abbr)" , "play again" , "Sum up (abbrev.)" .)

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