Male jewellery lacking design? (8)
I believe the answer is:
rambling
'lacking design?' is the definition.
(rambling can mean lacking structure or design)
'male jewellery' is the wordplay.
'male' becomes 'ram' (male sheep).
'jewellery' becomes 'bling' (informal term for jewellery).
'ram'+'bling'='RAMBLING'
(Other definitions for rambling that I've seen before include "Wandering, perhaps in speech" , "Countryside walking" , "Wordy" , "Confused; walking for pleasure" , "Of speech, disconnected and verbose" .)