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Daughter is in warm pants — that's the theory (9)

Ross

I believe the answer is:

darwinism

'that's the theory' is the definition.
(Darwinism is a scientific theory)

'daughter is in warm pants' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'pants' indicates anagramming the letters (UK informal term for 'nonsense' or 'rubbish').
'is'+'in'+'warm'='isinwarm'
'isinwarm' anagrammed gives 'arwinism'.
'd'+'arwinism'='DARWINISM'

(Another definition for darwinism that I've seen is " Theory of evolution by natural selection".)

I've seen this clue in The Times.
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