I follow around to feed low W (7)

'w' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'i follow around to feed low' is the wordplay.
'follow' becomes 'lag' (lagging is a kind of following).
'around' shows that the letters should be reversed in order.
'to feed' means one lot of letters goes inside another.
'low' becomes 'moo' (both can mean to make the noise of a cow).
'lag' back-to-front is 'gal'.
'i'+'gal'='igal'
'igal' inserted within 'moo' is 'MIGALOO'.

Can you help me to learn more?