People with guns? People with scissors have less power (7)
I believe the answer is:
snipers
'people' is the definition.
(sniper is a kind of person)
'scissors have less power' is the wordplay.
'scissors' becomes 'snips' (snips is a kind of scissors).
'have' is an insertion indicator.
'less power' becomes 'er' (I can't justify this - if you can you should give a lot more credence to this answer).
'snips' placed around 'er' is 'SNIPERS'.
'with guns? people with' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for snipers that I've seen before include "They take pot-shots" , "Lone gunmen" , "Sharpshooters" .)