Showing pale irises we had planted round garden walk (8)

'showing pale irises' is the definition.
(walleye is a condition causes pale irises)

'we had planted round garden walk' is the wordplay.
'we had' becomes 'we'd' (contraction of 'we had').
'planted round' is an insertion indicator.
'garden walk' becomes 'alley' (alley can mean a walk bordered by trees).
'wed' placed around 'alley' is 'WALLEYED'.