One in centre perhaps is the one trying to lead one astray (7)
I believe the answer is:
enticer
'the one trying to lead one astray' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'one in centre perhaps' is the wordplay.
'one' becomes 'I' (Roman numeral).
'in' is an insertion indicator.
'perhaps' indicates an anagram.
'centre' anagrammed gives 'entcer'.
'i' going inside 'entcer' is 'ENTICER'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for enticer that I've seen before include "temptress?" , "Who offers temptation" .)