The most common and most likely answer to this crossword clue is the 4 plus 2 plus 6 letter word TURN UP TRUMPS
I've seen this crossword clue in The Guardian
T
U
R
N
U
P
T
R
U
M
P
S
Buddy explains!
The straight part
We know that "ride to the rescue!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ride to the rescue! = turn up trumps.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.