Derrick is one of these, so this could indicate (6)
I believe the answer is:
hoists
'derrick is one' is the definition.
I can't judge whether this defines the answer.
'these so this could indicate' is the wordplay.
'so this' anagrams to 'HOISTS'.
But, I'm not sure how this is indicated.
'of' is the link.
Can you help me to learn more?
(Other definitions for hoists that I've seen before include "Lifts with ropes and pulley" , "Lifts with a crane" , "Raises or hauls up" , "Lifting devices" .)