Crossword Genius

Number get a fever that's ill-defined (5)

Ross

I believe the answer is:

vague

'ill-defined' is the definition.
(synonyms)

'number get a fever' is the wordplay.
'number' becomes 'v' (V is an example).
'get' is a charade indicator (letters next to each other).
'a fever' becomes 'ague' (illness causing fever).
'v'+'ague'='VAGUE'

'that's' acts as a link.

(Other definitions for vague that I've seen before include "Unclear" , "Unclearly defined" , "Nebulous" , "Indeterminate" , "Not clearly expressed or perceived" .)

I've seen this clue in The Telegraph and The Globe and Mail.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.