Crossword Genius

One or two fliers? (7)

Ross

I believe the answer is:

titlark

'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'two fliers?' is the wordplay.
'two fliers?' means two replacements for 'flier'.
'flier' becomes 'tit' (tit is a kind of birdanimal).
'flier' becomes 'lark' (lark is a kind of birdanimal).
'tit'+'lark'='TITLARK'

'or' acts as a link.

(Other definitions for titlark that I've seen before include "bird" , "One flying" , "Magic lamp possessor" , "Meadow pipit" , "songbird" .)

I've seen this clue in The Times.
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