Increases some inclination (7)
I believe the answer is:
steepen
'increases some inclination' is the definition.
Although both the answer and 'increases' are verbs, they are not in the same form of the verb.
'increases some inclination' is the wordplay.
'increases' becomes 'steep' (I can't justify this - if you can you should believe this answer much more).
'some' indicates the central letters.
'inclination' becomes 'bent' (bent is a kind of inclination).
The middle of 'bent' is 'en'.
'steep'+'en'='STEEPEN'
Can you help me to learn more?
(Other definitions for steepen that I've seen before include "Show increased inclination" , "Rise more quickly" , "Pet seen (anag.)" , "Begin to rise faster" , "Get more sloped" .)