Here in Calais, contents of lorry are unloaded in a cool manner (5)
I believe the answer is:
icily
'in a cool manner' is the definition.
(I've seen this before)
'here in calais contents of lorry are unloaded' is the wordplay.
I cannot quite understand how this works, but
'here in calais' could be 'ici' ('here' in French) and 'ici' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for icily that I've seen before include "In a chilling manner" , "Coldly" , "In a cold manner" , "In a frosty manner" , "In a cool manner" .)