I shout out loud and look up and down (7)
I believe the answer is:
eyeball
'look up and down' is the definition.
'eyeball' can be an answer for 'look' (eyeballing is a kind of looking). I'm not sure about the 'up and down' bit.
'i shout out loud' is the wordplay.
'i' becomes 'eye' (I've seen this in other clues).
'shout out' becomes 'bawl' (I've seen this in another clue).
'loud' indicates a 'sounds like' (homophone) clue.
'bawl' is a homophone of 'ball'.
'eye'+'ball'='EYEBALL'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for eyeball that I've seen before include "Stare at closely; organ" , "Watch" , "pupil found here" , "One of two in confrontation" , "Optic organ" .)