Give the last ball-point to (5)
I believe the answer is:
endow
'give' is the definition.
(endow can mean to give or bestow)
'last ball-point to' is the wordplay.
'last' becomes 'end' (I've seen this in another clue).
'ball' becomes 'o' (letter resembling a ball).
'point to' becomes 'w' (I can't explain this - if you can you should give a lot more credence to this answer).
'end'+'o'+'w'='ENDOW'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for endow that I've seen before include "supply" , "Provide with a permanent income, say a school" , "Settle permanent income on" , "Provide (with financial support, qualities etc)" , "Bestow" .)