The most common and most likely answer to this crossword clue is the 4 letter word RICH
R
I
C
H
More clues leading to the result RICH
- Lavish religious instruction supplied by church
- Flush fully or partly
- Heads for repast in hall after taking in college buttery?
- see 6dn.
- Deep fried successor for Nietzsche?
- Productive element in electric heater
- Having many possessions from mother I cherish
- Loaded, but ridiculous
- Abundant Religious Instruction given by church
- Rhode Island church is full
Buddy explains!

The straight part
We know that "ridiculous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ridiculous = rich.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.
What does RICH mean?
RICH verb- To enrich.
- To become rich.
- Wealthy: having a lot of money and possessions.
- Having an intense fatty or sugary flavour.
- Plentiful, abounding, abundant, fulfilling.
- Yielding large returns; productive or fertile; fruitful.
- Composed of valuable or costly materials or ingredients; procured at great outlay; highly valued; precious; sumptuous; costly.
- Not faint or delicate; vivid.
- Very amusing.
- Ridiculous, absurd, outrageous, preposterous.
- Elaborate, having complex formatting, multimedia, or depth of interaction.
- Of a fuel-air mixture, having less air than is necessary to burn all of the fuel; less air- or oxygen- rich than necessary for a stoichiometric reaction.
- Trading at a price level which is high relative to historical trends, a similar asset, or (for derivatives) a theoretical value.