Working as lecturer, perhaps, son going to a summit (8)
I believe the answer is:
speaking
'working as lecturer' is the definition.
I can't tell whether this defines the answer.
'son going to a summit' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'going' becomes 'ing' (I can't justify this - if you can you should give a lot more credence to this answer).
'to a' means one lot of letters go next to another (I've seen this in other clues).
'summit' becomes 'peak' (synonyms).
'ing' after 'peak' is 'peaking'.
's'+'peaking'='SPEAKING'
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for speaking that I've seen before include "Saying something" , "Conversing" , "oratory" , "Talking" , "conveying meaning" .)