Crossword Genius

Detectives walk taking lieutenant's first shift (8)

Ross

I believe the answer is:

displace

'shift' is the definition.
(I know that shift is a kind of displace)

'detectives walk taking lieutenant's first' is the wordplay.
'detectives' becomes 'dis' (Detective Inspectors, DIs).
'walk' becomes 'pace' (pacing is a kind of walking).
'taking' means one lot of letters goes inside another.
'lieutenant's first' becomes 'l' (pst letter of 'lieutenant').
'pace' enclosing 'l' is 'place'.
'dis'+'place'='DISPLACE'

(Other definitions for displace that I've seen before include "Oust" , "Remove from usual habitat" , "Move out of position" , "Supplant" , "Succeed" .)

I've seen this clue in The Telegraph.
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