Solid enough to keep to the very end (6)
I believe the answer is:
stocky
'solid' is the definition.
(I've seen this before)
'keep to the very end' is the wordplay.
'keep' becomes 'stock' (I've seen this before).
'to' is a charade indicator (letters next to each other).
'end' indicates one should take the final letters.
The last letter of 'very' is 'y'.
'stock'+'y'='STOCKY'
'enough to' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for stocky that I've seen before include "Broad" , "Strongly-built" , "Thickset" , "Short but well-built" , "Short and solidly built" .)