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Has a job examining relative's bloodline for Spike (6,6)

Ross

I believe the answer is:

family doctor

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'has a job examining relative's' is the definition.
I can't tell whether this defines the answer.

'bloodline for spike' is the wordplay.
'bloodline' becomes 'family' (family is a kind of bloodline).
'for spike' becomes 'doctor' (I can't explain this - if you can you should believe this answer much more).
'family'+'doctor'='FAMILY DOCTOR'

Can you help me to learn more?

I've seen this clue in The Irish Times.
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