An argument against time to finish and compete (7)

I believe the answer is:

contend

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'compete' is the definition.
(I've seen this before)

'an argument against time to finish and' is the wordplay.
'an argument' becomes 'con' (con is a kind of argument).
'against time' becomes 'ten' (I can't explain this - if you can you should give a lot more credence to this answer).
'to finish' suggests the final letters.
The final letter of 'and' is 'd'.
'con'+'ten'+'d'='CONTEND'

Can you help me to learn more?

(Other definitions for contend that I've seen before include "Compete, vie" , "Struggle; assert" , "Engage in a struggle" , "Compete; deal (with)" , "fight" .)

I've seen this clue in The Telegraph.

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