See about beginning to erect sign (3)
I believe the answer is:
leo
'sign' is the definition.
(Leo is an example)
'see about beginning to erect' is the wordplay.
'see' becomes 'lo' (archaic word meaning 'look!').
'about' means one lot of letters goes inside another.
'beginning to' suggests taking the first letters.
The first letter of 'erect' is 'e'.
'lo' enclosing 'e' is 'LEO'.
(Other definitions for leo that I've seen before include "Singer-songwriter Sayer, b. 1949" , "Lion sign of the Zodiac" , "sign of summer" , "of pride" , "Star sign of one born on August 1" .)