Substitute in centre of goal, jumping up, scored in time (1,5)
I believe the answer is:
a tempo
'in time' is the definition.
(thesaurus)
'substitute in centre of goal jumping up' is the wordplay.
'substitute' becomes 'temp' (I've seen this in another clue).
'in' indicates putting letters inside.
'centre of' says to take the centre.
'jumping up' shows that the letters should be reversed in order (in a down clue, letters go up).
The central letters of 'goal' are 'oa'.
'oa' in reverse letter order is 'ao'.
'temp' going into 'ao' is 'A TEMPO'.
'scored' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for a tempo that I've seen before include "In time (music)" , "At the previous speed (music)" , "Staff direction" .)