Crossword Genius

Bob, for instance, or I had to be replaced (6)

Ross

I believe the answer is:

hairdo

'bob for instance' is the definition.
(bob is a type of hairdo)

'or i had to be replaced' is the wordplay.
'to be replaced' indicates an anagram.
'or'+'i'+'had'='orihad'
'orihad' with letters rearranged gives 'HAIRDO'.

(Other definitions for hairdo that I've seen before include "The process of styling hirsute head" , "capital arrangement" , "Possibly cut" , "Eg, beehive or mullet" , "Styling of the locks" .)

I've seen this clue in The Telegraph.
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.