Crossword Genius

Songbird in series on box (7)

Ross

I believe the answer is:

sparrow

'songbird' is the definition.
(I've seen this before)

'series on box' is the wordplay.
'series' becomes 'row' (I've seen this before**).
'on' says to put letters next to each other.
'box' becomes 'spar' (sparring is a kind of boxing).
'row' after 'spar' is 'SPARROW'.

'in' acts as a link.

(Other definitions for sparrow that I've seen before include "House bird" , "Bird with cockney associations" , "a British resident" , "Small songbird" , "Little brown bird" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app