Hi Julksy,
14D. He directs from back seat during race = Jockey
Self explanatory
23D. Times three = Thrice
Five = v (in roman numerals)
Hundred = c (in roman numerals)
'thrive' minus 'v', plus 'C' = thrice
27D. Kids = Offspring
Cancelled = off
Pre-Summer season = Spring
28D. Happen = Take Place
assume seat = to 'take' your 'place'
33D. Help = Servant
'Taverns' is an anagram of 'Servant'
59D. Had a quiet laugh = Chortled
went first = led
'torch' + 'led' is an anagram of 'chortled'
25A. Codes = Cyphers (variant spelling)
At first = the first letter of each word
Codes You Produced Had Everyone Really Stumped = Cyphers
32A. Admiral's vessel = Flagship
'flip' + 'gash' is an anagram of 'flagship'
39A. Driving force = Spearhead
lance tip = spear head
46A. Drug = Nicotine
company = Co
'nine' + 'co' + 'it' is an anagram of 'nicotine'
Hope to talk to you again soon Julksy.
Warm Regards, Butterfly