Crossword Genius

For shift, doctor sat in for matron (14)

Ross

I believe the answer is:

transformation

'for shift' is the definition.
('transformation' can be a synonym of 'shift')

'doctor sat in for matron' is the wordplay.
'doctor' indicates anagramming the letters.
'sat'+'in'+'for'+'matron'='satinformatron'
'satinformatron' anagrammed gives 'TRANSFORMATION'.

(Another definition for transformation that I've seen is " Process of change".)

I've seen this clue in The Independent.
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