In case, having the bloke call on (8)
I believe the answer is:
covering
'in case' is the definition.
'covering' can be an answer for 'case' (thesaurus). I am not sure about the 'in' bit.
'the bloke call on' is the wordplay.
'the bloke' becomes 'cove' (both can informally mean a man).
'call' becomes 'ring' (telephone call).
'on' says to put letters next to each other.
'cove'+'ring'='COVERING'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for covering that I've seen before include "acting as a reporter" , "Sleeve" , "shelter" , "Enveloping" , "making new version of record" .)