Holding the double spike and poking about with (7)
I believe the answer is:
probing
'poking about with' is the definition.
I can't judge whether this defines the answer.
'holding the double spike' is the wordplay.
'holding' means one lot of letters goes inside another.
'the double' becomes 'bi' (I can't explain this - if you can you should believe this answer much more).
'spike' becomes 'prong' (I've seen this before).
'bi' going within 'prong' is 'PROBING'.
'and' is the link.
Can you help me to learn more?
(Other definitions for probing that I've seen before include "Investigating - prodding" , "Testing" .)