Unknown quantity at college lead with anthem from The Joshua Tree (5)
I believe the answer is:
yucca
'the joshua tree' is the definition.
(I've seen this in another clue)
'unknown quantity at college lead with anthem' is the wordplay.
I cannot really see how this works, but
'unknown' could be 'y' (algebra) and 'y' is located in the answer.
'quantity' could be 'c' (C is an example) and 'c' is located in the answer.
'college' could be 'u' (abbreviation for University) and 'u' is present in the answer.
The remaining letters 'ca' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'from' is the link.
Can you help me to learn more?
(Other definitions for yucca that I've seen before include "Tropical American liliaceous plant" , "houseplant" , "House plant with spiky flowers" , "exotic plant" , "Plant of the Agavaceae family" .)