Crossword Genius

Constant irrational desire (7)

Ross

I believe the answer is:

craving

'desire' is the definition.
(craving is a kind of desire)

'constant irrational' is the wordplay.
'constant' becomes 'c' (mathematical abbreviation).
'irrational' becomes 'raving'.
'c'+'raving'='CRAVING'

(Other definitions for craving that I've seen before include "Intense feeling of desire" , "longing" , "Powerful desire" , "Great desire" , "Hunger" .)

I've seen this clue in The Telegraph.
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