Bad time, having to leap around this summit (7)
I believe the answer is:
hilltop
'this summit' is the definition.
(hilltop is a kind of summit)
'bad time having to leap around' is the wordplay.
'bad' becomes 'ill' ('ill' can be similar in meaning to 'bad'**).
'time' becomes 't'.
'having' says to put letters next to each other.
'to leap' becomes 'hop' (hopping is a kind of leaping).
'around' is an insertion indicator.
'ill'+'t'='illt'
'illt' put inside 'hop' is 'HILLTOP'.
(Other definitions for hilltop that I've seen before include "Summit" , "watershed?" , "High" , "Brow of mound" , "Peak of an incline" .)