Senior person with gentle heart is quite accessible (5)
I believe the answer is:
ontap
'quite accessible' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'senior person with gentle heart' is the wordplay.
'senior person' becomes 'oap' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' is an insertion indicator.
'heart' means to look at the middle letters.
The central letters of 'gentle' are 'nt'.
'oap' going around 'nt' is 'ONTAP'.
'is' acts as a link.
Can you help me to learn more?
(Another definition for ontap that I've seen is " readily available".)