Perhaps I press on, with rift developing (5,6)
I believe the answer is:
first person
'perhaps i' is the definition.
'first person' can be an answer for 'i'. I am not certain of the 'perhaps' bit.
'press on with rift developing' is the wordplay.
'with' means one lot of letters go next to another.
'developing' is an anagram indicator (letters developed into a new form).
'press'+'on'+'rift'='pressonrift'
'pressonrift' with letters rearranged gives 'FIRST PERSON'.
Can you help me to learn more?
(Other definitions for first person that I've seen before include "Rebecca's written in it" , "was a faller at the outset" , "royal "we", say" , "I or we (grammar)" , "Adam" .)