We agree about pressure on European ancestors of ours? (6)
I believe the answer is:
ape-men
'ancestors of ours?' is the definition.
I can't tell whether this definition defines the answer.
'we agree about pressure on european' is the wordplay.
'we agree' becomes 'amen' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' is an insertion indicator.
'pressure' becomes 'p' (abbreviation).
'on' means one lot of letters go next to another.
'european' becomes 'e' (abbreviation e.g. EU).
'p'+'e'='pe'
'amen' going around 'pe' is 'APE-MEN'.
(Other definitions for ape-men that I've seen before include "Extinct human ancestors" , "Early humans" , "Extinct primates" , "Description of Tarzans" , "Multiple Tarzans" .)