Show up to have a look, we're told (6)
I believe the answer is:
appear
'show up' is the definition.
(both can mean to arrive)
'have a look we're told' is the wordplay.
'have' becomes 'ap' (I can't justify this - if you can you should believe this answer much more).
'a look' becomes 'peer' (to peer at something is to look at it).
'we're told' indicates a 'sounds like' (homophone) clue.
'peer' sounds like 'pear'.
'ap'+'pear'='APPEAR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for appear that I've seen before include "Develop" , "Seem - come into view" , "Turn up" , "Come into sight, materialise" , "hove in sight" .)