Crossword Genius

A number score twice with only headers (6-3)

Ross

I believe the answer is:

twenty-two

'a number' is the definition.
(twenty-two is a kind of whole number)

'score twice with only headers' is the wordplay.
'score' becomes 'twenty' (synonyms).
'headers' indicates taking the first letters (I've seen 'header' mean this (in a down clue, the letter at the top of the word)).
The first letters of 'twice with only' is 'two'.
'twenty'+'two'='TWENTY-TWO'

(Other definitions for twenty-two that I've seen before include "Number of players on pitch at start of soccer match" , "Number of yards in a chain" , "Two football teams" , "Line on rugby pitch; number" , "One more than this clue number" .)

I've seen this clue in The Guardian.
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